$b\:-\:3\:=\:-17$
$\left(-2k+n\right)\left(-2k-n\right)$
$x^3-x^2-9x-6$
$\lim_{x\to4}\left(\frac{x^2-4x}{x^2+3x-4}\right)$
$\int\:\frac{\sqrt{x^3}+3\sqrt{x}}{\sqrt{x^3}}dx$
$2\sec^2\left(x\right)-3=tan^2\left(x\right)$
$-3+2\cdot5-2\cdot\left[-5-3\cdot\left(-2\right)-\left(-10\right):\left(-2\right)\right]$
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